what you know about usability testing, which kind of test or tests might you do and why?

This question is from Chapter 11 Question #1 from nursing informatics and the foundation of knowledge fourth edition by Dee McGonigle and Kathleen Garver mastrian The question is: You are a member of a team that has been asked to evaluate a prototype smartphone based application for calculating drug dosages. Based on what you know about usability testing, which kind of test or tests might you do and why? No cover page needed, use as many sources as you’d like